A belt drive is required to drive a rotating brush that is used to clean rough external patio surface. A motor connected to a drive pulley drives the brush plate through a load pulley. Specify with relevant calculation the most appropriate flat belt and Vee belt drives for this showing Flat belt

Answer:

Torque transmitted by belt

Rated power

 = belt speed, fpm

= diameter of smaller

 = rpm of smaller sheave

Determination of larger sheave diameter (D2)

Where,  = rpm of smaller sheave

 = rpm of larger sheave

= diameter of smaller sheave.

Question 3

Part b). Explain how the belt works during power transmission

The friction drive of the belt is relying on the friction among the pulley as well as belt and it does also transmit the power. They also need the tensions which maintain the correct amount of friction. Then the flat belts are the pure from the friction drive as compare to the V-belts which have the friction multiplying effect due to wedging of the pulley action. The flat belts could also transmit the up to 150hp/in at the exceeding speed of the 20,000 fpm. The efficiency of flat belts is 99% regarding to the 2.5-3% better as compare to V-belts. It is good efficiency due to lower bending loses from the thin cross section which has the low creep due to the friction covers as well as the high modules of elasticity tractions layers as well as the edging actions into the pulley.

ii. What other options could be considered for this application. What might be implications of choosing alternative?

There are two options

·         Ensure the Peak drive performance

·         Ease of maintenance

The chai drive also permits the alternative for their roller chain in the different heavy duty application like the elevators, drum drive and conveyors. The application also needs the chain drive due to its durability which is able to withstand adverse for operating conditions.

iii.

A shown in the above graph, at the starting point the load power is increased by increased the load speed. But at the maximum point of the load speed the load power is also maximum, but after this the load power is decreased.

Question 3

c). The motor drives a load through chain drive. The sprocket on the load shaft has diameter 170mm. The sprocket on the motor shaft has the diameter 80mm.

i. Arrangement feasible to replace belt system

The replacement of the belt system is very easy due to the automotive drive of belt tensioners which is also eliminate required the loss end bolts which pry the components into the positioning of re-tensioning .

ii. Precaution that engineer include to implement drive

·         Routine Maintenance Inspection

·         The drive chain take-up and should also be inspected

·         Chain and belt tension must be adjusted and checked

·         Prevent the excess wear , twisting and improper engagement

iii. Standard Chain detail

The chain drive is also used to transmit the power in the one rotation of drive to the. The belt is the flexible power of transmission element which is also runs the tightly set of pulley. The chain is also designed by mesh of corresponding teeth on the sprockets which is located by driven shafts.